Yamamoto has spent the 2019 season in Double-A Jacksonville with solid results: 3.58 ERA, 1.19 WHIP, 64 K in 65.1 IP. Overall, he owns a 2.69 earned run average in 134 regular season innings since joining the Marlins organization in the Christian Yelich trade.
Already on the 40-man roster, there will need to be a corresponding move to fit him on Miami’s active roster. Tuesday’s starter Elieser Hernandez and left-hander Jarlin Garcia are among the candidates you could be optioned to Triple-A New Orleans on Wednesday.
(8:25 p.m. ET update: Multiple reports indicate that José Ureña will be placed on the injured list; Yamamoto will likely start in his place on Wednesday)
Yamamoto succeeds despite below-average fastball velocity (sitting 88-92 mph) thanks to a big breaking curveball, nasty changeup and sharp command. The Hawaii native was a guest on the Fish Stripes podcast last month, where he discussed life on and off the field.
The Jumbo Shrimp won 6-5 in extra innings on Tuesday afternoon. Yamamoto received the news afterward.
Yamamoto will arrive at Marlins Park fairly well rested—he made his most recent start on Friday. MLB Pipeline currently ranks him as Miami’s No. 17 overall prospect.